A B C E D N E V F I G H R O N M NATUAL I E K 10 N L M 11 T ENVIRONMENT N O P Q R S T U V X W Z Y ecology Carbon dioxide (CO2) grass Petroleum Nitrogen (N) Oxygen (O2) Vital definition Task 1.listen and complete the sentence by circling the letter A,B,C or D Ecology is the study of………………… a uman beings and animals b environment and solar energy ral and alternative resources c d human beings and their environment ? The natural environment consists of………… a the oceans and the land b the sun and the air c all natural resources d the air and the oceans ? If the resource can be……………., it is call renewable a burnt quickly b used easily c divided properly d replaced quickly ? Grass for animals is a…… .… resource a renewable b nonrenewable c limited d clean ? According to the passage, coal is nonrenewable because it takes ……………to make coal a billions of years b millions of years c three millions of years d three billions of years ? Task 2.listen again to the last part of the talk and write in the missing words Solar energy, air, and water are renewable resources because there is ……… .Supply However, this definition may change if people are not careful with these resources The amount of solar energy that reaches the earth depends on the……………….If the atmosphere is polluted, the solar, the solar energy that reaches the earth ………………… be dangerous If life is going to continue, the air must contain the correct amount of nitrogen (N), oxygen (O), carbon dioxide (CO2), and other ……………… if humans continue to pollute the air, it will not contain the correct………… of these gases an unlimited ? may amounts atmosphere gases Sources of energy Coal Geothermal heat Petroleum Solar energy Oil Wind energy Gas Nonrenewable nonrewable ... a billions of years b millions of years c three millions of years d three billions of years ? Task 2.listen again to the last part of the talk and write in the missing words Solar energy, air,... will not contain the correct………… of these gases an unlimited ? may amounts atmosphere gases Sources of energy Coal Geothermal heat Petroleum Solar energy Oil Wind energy Gas Nonrenewable nonrewable... and water are renewable resources because there is ……… .Supply However, this definition may change if people are not careful with these resources The amount of solar energy that reaches the earth